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Herein, we report the first example of light\u2010induced cryogenic elasticity in organic molecular crystals via photoactivated\n                    <jats:italic>E\u2192Z<\/jats:italic>\n                    isomerization. Crystals of a photoresponsive acylhydrazone derivative (\n                    <jats:bold>NPH<\/jats:bold>\n                    ) undergo surface\u2010localized isomerization upon 365\u00a0nm UV irradiation, inducing partial surface melting while maintaining internal crystallinity. This remote, postsynthetic modulation dramatically enhances mechanical compliance, enabling irradiated crystals to exhibit elastic deformation and photomechanical bending even in liquid nitrogen (77\u00a0K)\u2014whereas nonirradiated crystals fracture upon immersion, with only the fragments retaining photomechanical activity. This work represents a breakthrough in mechanically reconfigurable molecular crystals and establishes a generalizable strategy for designing stimuli\u2010responsive materials operable in extreme environments. These findings open new avenues for the development of cryogenic actuators, adaptive optical systems, and low\u2010temperature flexible electronics.\n                  <\/jats:p>","DOI":"10.1002\/anie.202516540","type":"journal-article","created":{"date-parts":[[2025,9,22]],"date-time":"2025-09-22T06:27:42Z","timestamp":1758522462000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Unlocking Cryogenic Flexibility in Organic Crystals via Photoinduced\n                    <i>E\u2192Z<\/i>\n                    Isomerization"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7062-6493","authenticated-orcid":false,"given":"Jiang","family":"Peng","sequence":"first","affiliation":[{"name":"Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education &amp; School of Chemistry and Chemical Engineering of Shanxi Normal University  Taiyuan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education &amp; School of Chemistry and Chemical Engineering of Shanxi Normal University  Taiyuan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengde","family":"Ding","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0219-3948","authenticated-orcid":false,"given":"Hongyu","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,9,21]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.msec.2021.112126"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41528-022-00188-2"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.colsurfb.2014.07.017"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2024.156251"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsapm.4c02511"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201204604"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/C8SC03135E"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202011857"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202200196"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-023-39162-5"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202300046"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202302807"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-023-43084-7"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dyepig.2023.111899"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202311762"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202400539"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpclett.4c01797"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202417459"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.4c11689"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202006474"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40843-023-2662-y"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202406184"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.molstruc.2024.140533"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40843-024-3140-4"},{"key":"e_1_2_7_25_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202110676"},{"key":"e_1_2_7_26_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2TC02667H"},{"key":"e_1_2_7_27_1","volume":"48","author":"Peng J.","year":"2023","journal-title":"Angew. 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